Wireless cell-phone headsets will set you free--if you can figure them out

Grand central terminal or Times Square? Last week, as I was preparing to test the new batch of wireless headsets for cell phones, I wanted to take them somewhere busy and bustling. After all, the whole point is to free you up while you're driving, shopping or--if you're in Times Square--clutching your wallet to keep pickpockets at bay.

But there was a problem. Before I went anywhere, I had to figure out how to use the darn things. New wireless units have begun to pop up in the past few months because of a new short-range radio technology called Bluetooth that's...